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The aim of this research was to evaluate the stability of spray-dried soluble  maté  ( Ilex paraguariensis)  and its total polyphenol content determined with the Folin–Ciocalteu assay, after it was elaborated with three different maltodextrin concentrations (0, 7.05 and 14.10% w/v) using experimental data of water activities and glass transition temperatures. Adsorption isotherms were determined for these three materials at 25°C between water activity values ( a  w ) of 0.1 and 0.85 (resulting in values of water content between 0.04 and 0.33 g of water/g of dried solid). Glass transition temperatures varied from 15 to 52°C. At room temperature powder containing 14.10% of maltodextrin at  a  w =0.55 was below the glass transition temperature, while the two other compositions were below their  T  g  and stable at  a  w =0.40. In the spray drying conditions analyzed, the loss of polyphenolic compounds is negligible. The total polyphenol content varied between 28 and 45 chlorogenic acid equivalents (g % dry powder).

Effects of Spray Drying Conditions on the Stability and Antioxidant Properties of Spray-Dried Soluble Maté